The system is parallel after the valve in the rear. That neans that both accumulators help each other (one reason to never replace just one). This also means that both struts see the same pressure. Both struts ought to impart equal support to the lift effort with equal pressure. Hard to imagine how they wouldn't.

The lift effort is a cooperation between the steel springs and the force generated by the struts. It is much easier to imagine differences in spring force side to side or even a structural leverage advantage (due to bent or worn components) giving total effort a different effect. Sounds like a lot of work to find the problem. I would probably first check wheel alignment on a lift where the body could be lifted to level. Verification of camber at equal level would go far to elliminate the leverage aspect of bent components. Then I would swap springs side to side if I were working for the government. Most likely, I would then be faced with an owner wishing a answer without paying for testing that would be guaranteed to produce results, at which point I'd probably loose interest.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician